I read somewhere a few years ago, thus I cannot cite source, that videogames are for millenials the immediate answer to that sense of achievement we lack in real life. They give you that feeling you can accomplish something by just putting effort and time (like in real life but ejem, easier). This feeling can become addictive for some people and that is why they become "adicted", it is not the game per se but the sense of achievement they get online rather than in real life, but it is not only online, ever wondered why Xbox unleashed "achievements" on almost anything the player did in game? Like, "Congratulations, you just unlocked the achievement: Jumping 15 times".

I think that study is wording your article here, Im glad to see other people think the same.

I played skyrim when it got released and damn, you did feel like a true dragon slayer after a couple of tens of hours playing.